Furnace bridge wall and cooling means therefor



P 1932- c. H. JOHNSON 1,878,524

FURNACE BRIDGE WALL AND COOLINGMEANS THEREFOR Original Filed Aug. 13, 1925 2 Sheets-Sheet 1 INVENTOR.

BY I I 9 Jul/a ATTORNEYS.

Sept. 20, 1932. H, HN ON 1,878,524-

FURNACE BRIDGE WALL AND COOLING MEANS THEREFOR Original Filed Aug. 15, 1925 2 Sheets-Sheet 2 5 WNVENTOR.

ATTORNEYS.

Patented Sept. 20, 1932.

UNITED STATES PATENT OFFICE" CHARLES H. JOHNSON, OF LUBURND- QE, MAS ACHUSETTS, ASSIGNOR TO THE 3A3- OOCK & WILCOX COMPANY, OF -BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY FUBNACE BBIDGE AND COOLING MEANS THEREFOR Application filed August 13, 1925, Serial No. 49,929. Renewed October 20, 1930.

My invention consists of certain novel parts and combinationspf parts,.particularly pointed out in the claims.

My invention will best be understood by reference to the accompanying drawing)? 1n which I have illustrated a preferred em diment thereof and in which Fig. 1 is a sectional sideview of a steam boiler of the general Stirling type in connection with which I have illustrated my invention; Fig. 2 is an enlargement of a part of Fig. 1; Fig. 3 is a view partially in plan'and partially in sect on of the boiler of Fig. 1-; Fig. 4 is a. front view of the bridge wall and the cooling tubes 16 associated therewith and Fig. 5 is an end view of the headers for the tubes associated with the bridge wall.

Like reference characters indicate like parts throughout the drawings.

Referring to the drawings 10, 11 and 12 are the upper transverse steam and water drums of a water tube boiler of the general Stirling type, in connection with which I have illustrated my invention, and 13 is a mud drum connected to the steam and water drums 10,

11 and 12 by banks of water tubes 14, 15 and 16, respectively. The front steam and water drum 10' is connected-to the middle drum 11 bywater circulators 17 and steam circulators 80 18, while the middle drum 11 is connected to the rear drum 12 by steam circulators 19, special tubes 20 being connected to the drum of the bank 16. Baflies 21, 22 and 23 are provided for directing the gases longitudinally of the tubes to an outlet flue 24, as will-be understood by those skilled in the art. The front wall of the setting is indicated at 25 and the rear wall thereof at 25C of the Stirling type. It is particularly appl cable to a boiler fired by two furnaces, which are indicated generally at 26 and 27 though not limited thereto, the furnaces be ing separated by a bridge wall 28, built on the foundation 29. This construction forms a combustion chamber for each furnace which is connected above the wall to a common combustion chamber beneath the first bank of tubes of the boiler. In the form shown, the

11 and extending across and forming a part My invention is not restricted to a boiler furnace 26 is fired by a chain grate stoker 30, above which is located an ignition arch 31 and a roof arch 32, the upper end of the roof arch being connected. toan auxiliary wall 33, which preferably forms a sliding joint at 34, with the front wall 25. In the form shown, the furnace 27 is fired by fluid fuel, a gas burner therefor being indicated at 35, and a roof arch therefor being indicated at 36. It will, of course, be understood that the form shown is merely illustrative and that any desired combination of furnaces and boilers may be used. Both burners may burn solid fuel or both fluid fuel (either gas or liquid). It will also be understood that both furnaces may be operated at the same time or either one alone.

M invention provides meansfor cooling take vertical headers 41 and 42, respectively.

These headers will preferably be located outside the furnace wall or setting, as shown, but may be located in recesses in the walls, or located inside the furnace. The" lower end of the downtake header 39 is connected by a pipe 43, in the form illustrated, to the mud drum 13, and the uptake header 40 is connected by a tube 44 to the steam and water drum 10. Similarly, the lower end of the downtakeheader 41 is connected by a pipe with the mud drum 13, and the uptake header 42 is connected by a tube 46 to the steam and water drum 10. The lower ends of the headers are preferably provided with suitably valved drain pipes 47. While the tubes-43 and 45 are shown connected to the mud drum 13, it will, of'coursc, be understood that they.

may be connected to another part-of the boiler, as, for example,-the steam and water drum 11.

'49, adapted to receive nace. By placing water the tiles,

' by curving the ends ner illustrated;

. practical and .wall and connected at and similarly cooled .a bank of tubes which take headers39 and 41,'and from the headers Thetubes 37 and 38 are preferably surrounded by tile or other refractory material,

indicated at 48,- and each formed with a recess one side of the tube, the inner ends of the tiles preferably being uare'and seated against the bridge wall,

. w ile the outer ends thereof are preferably curved, as at 50, on' the sides facing the furtubes located adjacent to the faces ofithe bridge wall 28, the wall is kept comparatively cool and may, according'ly, be made comparatively thin.- At the same time, by surrounding the tubes by a certain. amount of heat is reflected back to the furnace, thereby increasing the efliciency thereof, and this action is promoted of the tiles in the man- In the embodiment of m. invention illustrated, the wall cooling tu es are connected into the circulatory system of the boiler and I are disposed on opposite sides of the furnace wall and substantially parallel thereto and in such locations as to cool one part of the wall by the tubes on one side and another part of the wall by the tubes on the other side. Such construction gives greater structural latitude and greater freedom for the connections. Furthermore, the construction is more provides an easier way of manufacture than'where the tubes are otherwise arranged.

In the construction illustrated, for example, the wall surface is substantially rectangular in elevation, and is cooled on one side by a bank of inclined tubes parallel to the their ends-to headers, on the opposite side by are parallel to the wall and, which are also connected to headers. Now, if it were attempted to cool the entire wall by a single bank of tubes, and they covered the entire surface thereof, then the downtake headers, as illustrated in 4, would have to extend below the wall an the uptake ,headers would have to extend above the wall, with the result that there would be a portion of the tubes not located adjacent to the wall at all, but some of them would extend into the furnace, with the result that they would not only not be beneficial, but deleteri- --ous, in that they would cool to a certain extent the furnace gases. The invention, therefore, provldes a structure which produces satisfactory cooling of the walls without undue length of headers and at less cost,

The operation of the boiler embodying my invention will readily be understood from the foregoing description and is as follows: The water from the mud drum 13 (or. the steam and water drum 11, when the tubes 43 and 45 are connected thereto) flows through the tubes 43 and 45120 the lower ends of the downthrough the respective banks of, tubes to through said f said boiler,

the uptake headers 40 and 42, and then through the tubes 44 and 46 to the steam and water. drum from which the water is returned to the mud drum 13, boiler of the type illustrated.

I claim 1.' In combination, combustion chambers separated by a bridge wall and connectedabove said wall to a common combustion chamber, tubes over which the gases pass from said common combustion chamber, and a plurality of coolin tubes disposed on the opposite sides of sa1d wall and substantially covering said sides.

2. In combination, two furnaces having combustion chambers separated by a bridge wall and connected above said wall to a common combustion 'chamber, tubes over which the gases pass from said common combustion chamber, a plurality of cooling tubes disposed on the opposite sides of said wall and substantially covering said sides, and a covering of refracto material over said tubes.

3.-In combination, two furnaces having combustion, chambers separated by a bridge wall and connected above said wall to a common combustion chamber, tubes over which the gases pass from said common combustion chamber,- a plurality of cooling tubes disposed on the opposite sides of said wall, and means causing circulation of a cooling fluid tubes in. opposite directions on the opposite sides of the wall.

4. In combination, two furnaces having combustion chambers separated by a bridge wall and connected above said wall to a common combustion chamber, a steam boiler having tubes over'which the gases pass from said common combustion chamber, and water tubes disposed on opposite" sides of said bridge wall and substantially covering said sides and connected to of said boiler.

5. In combination, two furnaces having combustion chambers separated by a bridge the circulating system' two furnaces having wall and connected above said wall to a com-'- an substantially covering said sides and eonnected to the circulating system of said boiler, an]?e a covering of refractory material for said tu s.

6. In combination, two furnaces having combustion chambers separated by a bridge wall and connected above saidwall to a common combustion chamber, a. steam boiler having tubes over which the gases pass from said common combustion chamber, 'water tubes disposed on opposite-sides of said bridge wall and connected to the circulating system of and means causing circulation of water through said water tubes in opposite irections' on the opposite sides of said wall.

gases pass from said 7. In combination, a furnace wall having opposite sides each exposed to a source of heat, a plurality of cooling tubes disposed on opposite sides of said wall and substantially parallel thereto, and means causing circulation of a cooling fluid through said tubes in opposite directions on said opposite sides of the wall.

8. In combination, a furnace wall,- a plurality of tubes disposed adjacent said wall on opposite sides thereof, the tubes on oneside being inclined to the horizontalin one direction and those on the other side being inclined .to the horizontal in the other direction, whereby a flow through the tubes in opposite directions is caused.

9. In combination, a furnace wall having opposite sides each exposed to heat, a plurality of cooling tubes connected into the circulatory system of the boiler and disposed on opposite sides of said wall and substantially parallel thereto in such locations as to cool one part throughout its'thickness substantially entirely by the tubes on one side of the wall and another part throughout its thickness substantially entirely by the tubes on the I other side of the wall.

10. In combination, a furnace wall having opposite sides each exposed to heat, apluly the remaiifin rality of cooling tubes connected into the circulatory system of the boiler and disposed on opposite sides of said wall and substantially parallel thereto in such locations as to 0001 one part throughout its thickness substantially entirely by the tubes on one side ofthe wall and another part throughout its thickness substantially entirely by the tubes on the other side of the wall, and substantialportion of the wall by the s1 es.

tubes on both CHARLES H. OHNSON. 

